Labraid Loingsech, also known as Labraid Lorc, was, according to medieval Irish legend and historical tradition, a High King of Ireland. A king above all the other Kings. He was an ancestor of the Laigin clan, who gave their name to the province of Leinster. There is an early dynastic poem that calls him "a god among the gods", suggesting he may once have been an ancestor-deity of the Laigin.
Irish Mythology - Mythical Cycle - Book of Invasions
